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test_runner: error on mocking an already mocked date #55858

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test_runner: error on mocking an already mocked date #55858

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3 changes: 3 additions & 0 deletions lib/internal/test_runner/mock/mock_timers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -328,6 +328,9 @@ class MockTimers {
#createDate() {
kMock ??= Symbol('MockTimers');
const NativeDateConstructor = this.#nativeDateDescriptor.value;
if (NativeDateConstructor.isMock) {
throw new ERR_INVALID_STATE('Date is already being mocked!');
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}
/**
* Function to mock the Date constructor, treats cases as per ECMA-262
* and returns a Date object with a mocked implementation
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7 changes: 7 additions & 0 deletions test/parallel/test-runner-mock-timers-date.js
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Expand Up @@ -117,4 +117,11 @@ describe('Mock Timers Date Test Suite', () => {
assert.strictEqual(fn.mock.callCount(), 0);
clearTimeout(id);
});

it((t) => {
t.mock.timers.enable();
t.test('should throw when a already-mocked Date is mocked', (t2) => {
assert.throws(() => t2.mock.timers.enable(), { code: 'ERR_INVALID_STATE' });
});
});
});
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